Did some XP tests today (yes, I know I've got too much time on my hands).
My Greek side had the following units: 1 General, 1 Mil.Cav, 1 Peltast, 2 Armored Hoplites (1 with 1XP and 1 with 2XP), 2 Archers
The enemy rebels had 1 General, 2 Velites, 2 Peasants
The odds were 20:9 in my favor. I thought it would be a nice battle to start tests since archers can easily avoid casualties.
Below is the raw data for kills for the same battle above fought 5 times:
All kills are made on non-routing units.
Code:
Archer1
91 Peasants, 28 Velites XP1
69 Peasants XP1
59 Peasants XP0
65 Peasants XP0
3 Peasants, 66 Velites XP1
Archer2
25 Peasants, 49 Velites XP1
51 Velites XP0
63 Velites XP0
6 Peasants, 68 Velites XP1
68 Peasants XP0
Conclusion: It takes exactly 69 kills to level up an archer unit from XP0 to XP1. Quality of kills do not seem to matter.
I can upload the saved file if anyone is interested in helping to test. If there are enough interested parties, we might want to split this post off and make a separate thread titled say "XP and kills".
EDIT: It occurs to me that 69 is a rather odd number and I'm not sure if there are other factors modifying this so I will qualify the above results as being played on VH/VH and on normal unit size (40 men for an archer unit).
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